Four point charges 2*10-9C, 1*10-9C, -2*10-9C, 3*10-9C are placed at t – McqOptions

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1.	Four point charges 210^-9C, 110^-9C, -210^-9C, 310^-9C are placed at the corners of a square of side length 2m. What is the electric potential at the center of the square?
A.	36V
B.	-36V
C.	2*10<sup>-9</sup>V
D.	Zero
Answer» B. -36V

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